Certified tool
Volume Converter
Convert liters, cubic meters, US gallons, and Imperial gallons without mixing the two gallon systems.
Exact defined conversion
3.785412 L
1 US gal → Liter
Cross-system conversion: US customary → SI / metric. Factors are not silently aliased.
Systems: us-customary → si.
Assumptions
- The US gallon is 231 cubic inches = 3.785411784 L exactly.
- The Imperial gallon is 4.54609 L exactly.
- US fluid ounce is 1/128 US gallon. Imperial fluid ounce is 1/160 Imperial gallon.
- Dry pints, pecks, and bushels are not included.
Examples
- 1 US gallon = 3.785411784 liters (exact).
- 1 Imperial gallon = 4.54609 liters (exact).
- 1 US fluid ounce = 29.5735295625 milliliters.
- 1 Imperial fluid ounce = 28.4130625 milliliters.
How to use
- Enter a non-negative volume.
- Pick units from SI, US customary liquid, or Imperial liquid groups. The names are not interchangeable.
- Swap to reverse the pair.
Limitations
- A “gallon” without a US or Imperial label is ambiguous. This tool never aliases them.
- Cooking cups and spoons live on the cooking converter.
FAQ
- Which gallon should I use?
- Use US gallon for US fuel and most US recipes. Use Imperial gallon for UK fuel and older UK recipes. They differ by about 20%.